Isaac l



@uitrit gtst/rs @anni @fitta MODE OF PRINTING 0N GLASS.

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TO ALL WHOM IT MAY CONCERN:

Be it knownthat I, ISAAC' L. MILES, of Charlestown, Massachusetts, haveinvented a Mode of Printing on Glass; and I do hereby declare thefollowing to be a full, clear, and exact descriptionaof the same,reference being had to the accompanying drawing, and to the letters ofreference marked thereon.

My invention consists in transferring an impression from a form ofelastic type having a rounded surface to a ilat plate of glass, byrolling the latter over and in contact with ways arranged adjacent toand having a curvature corresponding with that of the form of type, asdescribed hereafter..

In order to enable others to practise my invention, I will now proceedto'describe the manner in which it may be carried in to eiect. Onreference to the accompanying drawing, which t'orms apart of thisspecification- Figure 1 is a sectional elevation of apparatus `forcarrying out my improved mode of printing on glass.

Figure 2, a plan view. A

Figure 3, an inverted .plan view; and

Figure 4, an end view, looking in the direction of the arrow, tig. 1.

A is a box or case, in the top B of which are three parallel slots, a ab, the middle slot bbeing the shortest. Across an opening in one side ofthe box extends a pin, c, to which is hung a lever, C, the inner end ofwhich is confined vertically to the lower end of a block, D, the latterbeing arranged to slide up and down in an opening inthe centre of thetop B of the box. In the upper end of the block D is a dove-tailedrecess or groove, in' which tits a dove-tailed projection, d, at theunder side of a plate, E, the latter resting on the plate B., and havinga curved or rounded Vupper surface, to which is secured a curvedform,fxrbielasticutype. At OppOSite sides of the plate E are adjustablestrips or ways, F F', the upper edges cfu-which are curved to correspondto the curvature of the face of the form X of types, and are level, ornearly level, with the surface of" the latter. On the curved edgeof-each way, F F, is secured a strip, e, of gum-elastic, or othermaterial which will serve the purpose described hereafter. Each of theways F F is provided with two projections. which extend through and areguided by the slots a, and between two parallel strips or clamps, g gand g g', the former being secured to the under side of the plate B atright angles to the slots a, and the latter sliding on projections, t',at the side of the box, and being maintained in contact with theprojectionsfy0 by set-screws h h. On the plate B, at one side of andparallel to the way F', rests an adjustable strip or guide, H, the upperedge of which projects above that of the way, the said guide beingsecured in the position to which it may be adjusted by a thumb-screw, k,projecting through the slot @and having on the lower end a nut, m, whichbears against the under side of the plate B. The cuter end of the leverC is depressed, and the plate E and its type are raised so `that thesurface of the latter may be coated with ink or other desiredcomposition, after which the plate is depressed until it again rests onthe top B of the box. The strip H is adjusted to such a position that itwill serve as a guide against which one edge ofthe plate of glass iscaused to bear, thereby determining the position of the printed matteron the said'glass. The sheet Y of glass iS held in the position shown intig. 4, so that it may ruest near one of its edges at the top and nearthe end of the ways F F. The operator then gradually depresses thehighest edge of the glass, so as to move or roll it over and in contactwith the ways F F', without permitting it to slide over or to beelevated free from contact with the said ways; the glass, as it is thustno-ved, being brought in contact with the inked surface of the elastictype from which an impression is thus taken. It' a plate ofl glass bepressed on to a flat bed of elastic type, so as to receive at once theentire impression, the latter is apt to be blurred and irregular, unlessthe glass be perfectly flat, which is rarely the case. Vhen rolled overthe curved surface of the type, however,in the manner described, a clearand otherwise perfect impression is obtained, as many practical testshave demonstrated. The importance of covering the ways F F withgumelastic or other material having a tendency to prevent the glass fromsliding on the ways, will be understood without explanation. Whennecessary, the plate Emay be readily net-ached from the block I) bysliding it sideways, so as to withdraw the dove-tailed projection d fromthe recess in the block, to make way for another plate with a diiferentform of-4 type. l

Although I have described minutely apparatus by means of which myinvention may be carried into effect, and which I have used toadvantage, I do not desire to confine myself to that apparatus; but Iclaim as my invention, and desire to secure by Letters Patent-Transferring an impression'frm a form of elastic type, having a roundedor curved surface, to a ila-t plate or sheet of glass, by rolling thelatter over and in contact with ways arranged adjacent to and having acurvature corresponding with that of theface of the form of type, asdescribed.

In` testimony whereof I have signed my name to this specification inthepresence of two subscribing witnesses.

ISAAC L. MILES.

Witnesses:

CHARLES E. Fos'rnn, JOHN WHITE.

